AP_DDS: Changed AP_DDS_Client.cpp to use the set_and_save_by_name_ifc…

…hanged method to set parameter.

libraries/AP_DDS/AP_DDS_Client.cpp

@@ -777,8 +777,6 @@ void AP_DDS_Client::on_request(uxrSession* uxr_session, uxrObjectId object_id, u
                 continue;
             }
 
-            float old_value = vp->cast_to_float(var_type);
-
             // Add existing parameter checks used in GCS_Param.cpp
             if (parameter_flags & AP_PARAM_FLAG_INTERNAL_USE_ONLY) {
                 // The user can set BRD_OPTIONS to enable set of internal
@@ -794,14 +792,8 @@ void AP_DDS_Client::on_request(uxrSession* uxr_session, uxrObjectId object_id, u
                 continue;
             }
 
-            // set the value
-            vp->set_float(param_value, var_type);
-
-            // Force the save if the value is not equal to the old one
-            bool force_save = !is_equal(param_value, old_value);
-
-            // save the change
-            vp->save(force_save);
+            // Set and save the value if it changed
+            bool force_save = vp->set_and_save_by_name_ifchanged(param_key, param_value);
 
             if (force_save && (parameter_flags & AP_PARAM_FLAG_ENABLE)) {
                 AP_Param::invalidate_count();